1.What is egoism? What is psychological egoism? What is the difference between the two?

Question

2.What is the difference between utilitarianism and egoism?

Need some ideas

Answer 1

http://plato.stanford.edu/entries/egoism/

http://caae.phil.cmu.edu/cavalier/80130/part2/Routledge/R_Egoism.html